采用4-WFRFT和人工噪声的变换域通信物理层安全传输  

Secure Transmission for TDCS Using 4-WFRFT and Noise Insertion

作　　者：王舒[1] 达新宇[1] 褚振勇[1] 朱丽莉[1] 

机构地区：[1]空军工程大学信息与导航学院,陕西西安710077

出　　处：《四川大学学报（工程科学版）》2016年第3期142-147,共6页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(61271250)

摘　　要：为了提高变换域通信(TDCS)信号的物理层安全性,提出一种基于4项加权分数傅里叶变换(4-WFRFT)和人工噪声的TDCS信号加密方式。利用4-WFRFT代替传统TDCS中的DFT/IDFT,改变了TDCS信号的空间分布,在保持原系统复杂度的同时增加了TDCS信号的抗截获性。在此基础上,使用人工噪声进一步增强系统的安全性,并推导了非法用户理论误码率以及系统保密容量。仿真结果表明,无论是全频谱还是频谱失配情况下,当参数α在[0,0.8)或(1.7,4]时,窃听者误码率始终保持在0.5,故无法正确解调发送信号,同时,系统保密容量为正数,有效保证了信息的安全传输。In order to guarantee the physical layer security of the transform domain communication system （TDCS）, a security-enhanced scheme based on 4-weighted-type fractional Fourier transform （4-WFRFT） and artificial noise insertion was proposed. Firstly, the 4- WFRFT was applied to TDCS instead of the discrete Fourier transform （DFT） and inverse discrete Fourier transform （ IDFT）, which maintained the system complexity while made the distribution of TDCS signals change in the complex plane. Then the artificial noise was inserted to further enhance the security. The expression of the bit error rate（BER） and the security capacity for eavesdroppper were obtained. Simulation results showed that whether with or without spectrum mismatch,the BER for eavesdropper kept 0.5 and the security capacity was positive when was in the range of [ 0, 0.8） or （ 1.7, 4 ] in the security-enhanced TDCS.

关 键 词：变换域通信系统 加权分数傅里叶变换 人工噪声 物理层安全 

分 类 号：TN914.42[电子电信—通信与信息系统]